Jeremiah 34:13-16

“Thus says the LORD, the God of Israel: ‘I made a covenant with your fathers in the day that I brought them out of the land of Egypt, out of the house of bondage, saying, “At the end of seven years let every man set free his Hebrew brother, who has been sold to him; and when he has served you six years, you shall let him go free from you.” But your fathers did not obey Me nor incline their ear. Then you recently turned and did what was right in My sight—every man proclaiming liberty to his neighbor; and you made a covenant before Me in the house which is called by My name. Then you turned around and profaned My name, and every one of you brought back his male and female slaves, whom you had set at liberty, at their pleasure, and brought them back into subjection, to be your male and female slaves.’